# Sebastien de Halleux

> Sebastien de Halleux is a seed investor at Graph Ventures backing Software and SaaS. See 17 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Graph Ventures](https://shizune.co/investors/profile/graph-ventures)
- Location: San Francisco, United States
- Total investments: 17
- Last investment: May 2022
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: http://www.linkedin.com/in/sdehalleux
- X (Twitter): http://twitter.com/sebdeh
- Website: https://graph.vc
- Facebook: http://www.facebook.com/sdehalleux

Sebastien de Halleux is a seed investor at Graph Ventures in San Francisco focused on Software and SaaS. Sebastien de Halleux has a 20-year track-record of launching startups around the world, leading them from idea to success. Sebastien is currently Chief Gaming Officer at Matchday, building a new type of game for football's 5 billion fans. Sebastien is also a founding General Partner at Graph Ventures, an early stage fund with a portfolio of300+ companies including Blue Apron, Ipsy, Envoy, and Dapper Labs. Most recently, Sebastien was Entrepreneur-in-Residence at Capricorn, a pioneering investment group focused on scaling innovative solutions to persistent global problems, including key investments in Tesla, SpaceX, Planet Labs, Quantumscape and Joby Aviation and founding COO of Saildrone, helping launch a category-defining company which revolutionized planetary data collection at sea, using wind and solar powered ocean drones. At the confluence of autonomy, big data and AI/ML, Saildrone pursued a vision called ‘The Quantified Planet’ to help better understand key planetary systems that affect humanity, such as extreme weather, ocean acidification, and global fisheries. Formerly, Sebastien was Co-Founder and COO of Playfish, one of the largest and fastest growing social video games companies which was acquired by Electronic Arts in 2009 (Nasdaq:EA). Prior to founding Playfish, Sebastien helped launch Glu Mobile, an early pioneer in mobile games which IPO'ed in 2007 (Nasdaq:GLUU) and held innovation and strategy roles at Nokia and Booz Allen Hamilton. Sebastien is the recipient of the 2012 EA Emerging Leaders Award, the 2011 Tech 100 award, the 2010 TechFellow award, and the 2003 Booz Allen Professional Excellence Award. His contribution in establishing a successful public-private partnership between Saildrone and the National Oceanic and Atmospheric Administration (NOAA) was recognized with the 2020 Ron Brown Excellence in Innovation Award and the 2018 US Department of Commerce Bronze Medal. Sebastien has served on the boards of Saildrone, Samasource, Vittana, UWC-USA, the Solar Fuel Institute, and Trusted Family. Sebastien holds a Master’s degree in Civil and Environmental Engineering from Imperial College London and is a Henry Crown Fellow at the Aspen Institute.

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $4.3M–$9M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 3 | 18% |
| SaaS | 2 | 12% |
| Transportation | 2 | 12% |
| Marine Transportation | 2 | 12% |
| B2B | 1 | 6% |

34 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 10 | 59% |
| Pre-Seed | 4 | 24% |
| Angel | 1 | 6% |
| Series A | 1 | 6% |
| Funding Round | 1 | 6% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 9 | 53% |
| France | 1 | 6% |
| Belgium | 1 | 6% |
| Switzerland | 1 | 6% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Kosmik | Kosmik is a visual collaboration platform. Kosmik is based around a zooming user interface where you can store and edit any type of data. Kosmik is the first "dSaaS" (decentralized Software as a Service), relying on a custom designed peer-to-peer database, maximizing user privacy, offering offline first comfort and end to end encryption. |  | Seed | May 15, 2022 |  |
| Kosmik | Kosmik is a visual collaboration platform. Kosmik is based around a zooming user interface where you can store and edit any type of data. Kosmik is the first "dSaaS" (decentralized Software as a Service), relying on a custom designed peer-to-peer database, maximizing user privacy, offering offline first comfort and end to end encryption. |  | Pre-Seed | May 15, 2022 |  |
| Wet Dog Weather | Wet Dog Weather makes a SaaS platform for weather and sensor data dissemination and display. Our focus is on fact, interactive, and performant interactive data visualization. | $600K | Pre-Seed | Mar 01, 2022 |  |
| Wet Dog Weather | Wet Dog Weather makes a SaaS platform for weather and sensor data dissemination and display. Our focus is on fact, interactive, and performant interactive data visualization. |  | Seed | Jan 01, 2022 |  |
| Formally | Formally is a legal collaboration company seeking to use intelligent technology and accessible design to simplify legal processes and increase access to justice. |  | Seed | Nov 09, 2021 |  |
| Formally | Formally is a legal collaboration company seeking to use intelligent technology and accessible design to simplify legal processes and increase access to justice. |  | Pre-Seed | Nov 09, 2021 |  |
| neuroClues | PCUBE-LAB are developing NeuroClues, a solution to instantaneously quantify your clinical exam based on a portable laboratory using eye tracking. | $4.9M | Seed | Nov 08, 2021 |  |
| ClearSpace | ClearSpace is a spin-off of EPFL and was founded in early 2018 to lead the development of sustainable in-orbit services in the tracks of the EPFL CleanSpace One (CSO) mission. ClearSpace develops on-orbit technologies and provides services for non-functional satellites in orbit. ClearSpace has signed a service contract with ESA to lead the firstmission to remove a Space Debris autonomously called ClearSpace-1. | $4.3M | Seed | Jun 30, 2021 |  |
| SailPlan | SailPlan simplifies the way ships, yachts, and the marine industry collects, processes, and analyzes data. We specialize in providing customized data infrastructure solutions for marine applications that help improve their efficiency, safety, and profitability. |  | Pre-Seed | Jun 01, 2021 |  |
| Cut+Dry | Cut+Dry is a unified digital ordering and payment platform that allows restaurants to identify, purchase, and pay for any product. |  | Seed | May 05, 2021 |  |

10 of 17 investments shown.

## Co-investors
- [Graph Ventures](https://shizune.co/investors/profile/graph-ventures) — VC Fund, 4 deals together
- [Asymmetry Ventures](https://shizune.co/investors/profile/asymmetry-ventures) — VC Fund, 2 deals together
- [Caffeinated Capital](https://shizune.co/investors/profile/caffeinated-capital) — VC Fund, 2 deals together
- [Limburgse Reconversie Maatschappij](https://shizune.co/investors/profile/limburgse-reconversie-maatschappij) — VC Fund, 2 deals together
- [Swisscom Ventures](https://shizune.co/investors/profile/swisscom-ventures) — VC Fund, 2 deals together
- [500 Global](https://shizune.co/investors/profile/500-startups) — VC Fund, 1 deal together

## About Graph Ventures

VC Fund · Palo Alto, United States

Graph Ventures is an investment group that specializes in seed and early-stage venture investments. It was founded in 2011. Investments include: * BetterUp * Birdies * BlueApron * Dapper Labs * Earnin * Envoy * Hinge * Houseparty * Ipsy * Loft * Lever * Lingokids * Moon Express * Papaya * PicsArt * Porch * Quinto Andar * RideOS * Saildrone *Very Good Security * VivaReal * Zeplin

5 contacts available at Graph Ventures.

| Name | Title | Profile |
| --- | --- | --- |
| Brian Truong | Partner | https://shizune.co/investors/profile/brian-truong |
| Matt Wyndowe | Founding Partner | https://shizune.co/investors/profile/matt-wyndowe |
| Razmig Hovaghimian | Partner | https://shizune.co/investors/profile/razmig-hovaghimian |
| Sebastien de Halleux | Founding Partner | https://shizune.co/investors/profile/sebastien-de-halleux |
| Alexandra Brown | COO & Partner | https://shizune.co/investors/profile/alexandra-brown-2 |

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## FAQ

### What does Sebastien de Halleux invest in?

Sebastien de Halleux invests primarily in Software, SaaS and Transportation startups, most often at Seed and Pre-Seed stage. Most of the 17 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Sebastien de Halleux's check size?

Sebastien de Halleux typically joins rounds of $4.3M–$9M at Seed. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Sebastien de Halleux participates in.

### When did Sebastien de Halleux last invest?

The most recent investment recorded for Sebastien de Halleux closed in May 2022. Shizune tracks 17 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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